Thbbad-cxjttiwa machzete



C. F. WILLIAMS.

THREAD cufims MACHINE.

APPLICATION FILED JULY 20| I9I8.

1 Patented Oct. 14,1919.

3 SHEETS-SIIEEI' 1 I C. F. WILLIAMS. IHREM) CUTHNG MACHINE.

APPLICATION man mu :0. ma.

Patented 'Oct. 14,1919.

3 SHEETS-SHEET 2.

'll. QDLIJIIIA PLAMDGIAPH 60-, WASHIIU'IUN. D. C.

' C. F. WILLIAMS.

THREAD CUTTING MACHINE.

APPLICATION mm um 20. um.

Patented Oct. 14,1919.

3 SHEETS-SHEET 3 I. will mod-AI" c0. VIAlllIIkl'rml, II. c

PATENT OFFICE.

CHARLES. I. WILLIAMS, OF ERIE, PENNSYLVANIA. THREAD-CUTTING- MACHINE.

UNITED STATES Specification of Letters Patent. Patented Oct, 14, 1919. Application filed July 20, 1918. Serial No. 245,817.

signed with a change speed mechanism controlled by the levers 5. It will be understood that the thread itself will accomplish the feeding action after the thread is started To all whom it may concerns Be it known that I, Crmnnns F. WIL- LIAMS, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useif desired so'that the entire feeding action ful Improvements in Thread-Cutting Mamay be accomplished by starting through chines, of which the following is a specifi'cathe and wheel 5.

extends upwardly from the he die head 8 standard 6. 10 in which tion.

This invention relates to thread cutting machines and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

ore particularly the invention is designed to out tapered threads, such as are ordinarily used on pipes. The common practice at present is to out such threads'by means of dies having cutting faces of sufficient width to cover the entire thread so by giving to such cutting faces the de- The cam ring is also ribs 14: which extend the chasers 9. The

wardly to the work. provided with the cam into the grooves 15 in purpose of these ribs is to return, or retract, the chasers. Openings 16 are provided in I the ring 11 so as to permit the ready sembling of the chasers. provided by, meansofwhich the cam ring pi e as the threads and it also makes: it maybe swung to set thecha ers in working di cult to extend the thread to any great PQSitlOIrand to retract them. length. With the present machine, the releasing plate 19 is also rotatively mounted on the head 8. It has a circum- 20. A screw 21 extends ferential slot. thread is advanced and any throughthe slot 20 into'a cam ring 11 and a thread may be made that may be desired. 01 In carrying out the invention in order to is arranged on the screw 21 and form t with a comparatively to clamp the ring 19 with the cam ring 11 so as to compel them to move in unison when in operation.

A log 23 extends and a stop screw 24 isarranged in in the ath of a pin v 19. T is forms an adjustable means for locating with nicety the initial position of the ring 1 9 and In consequence the cam ring 11: i

from the standard 6' to provide for the taiper that is-usually proh l t is ,ug

vlded in the body 0 the tool itself.

"T e invention is illustrated in the accompanying'drawings as follows F gure I shows a side elevation of a thread cutting machine.

' ig. 2 an end elevation, .a part being bro en away to better show construction. lug 26 is secured, to the ring 19" Fig. 3 a section on the line 33'i n' Fig. 2. and projects. into a cam slot 27 in" a. ig.4 a section on theline H inFig. 2. cam block 27, the cam block being se- Fig. 5 a section on the line 5-5inFig. 2'; cured" on a post. 28 by, means of screws 1 marks the machine frame, 2 the driving 29- [The cam groove '27 has a pitch, or spindle, or head, 3 a length of; ipe being slant, snificient to rotate the ring 19"and with it the jcam ringll so that; the ohasers.-are peritiitted tof expand in accordance with the taperithat it? is. desired 'to p is slidingly mounted on the guide 7 on the frame. It is ada ted to be moved by means of the hand wh e1 5 through the ordinary mechanism (not shown) for the purpose. It'is also deon the can; surface;.,or i the cam groove 27,

Infie operation of the'machine so as described the dies are set by swinging the 25 secured to the ring v 've thelth readl As the anaadvanees alid 'tffe lug 26 moves' late swungt'o the right as shown the chasers have out a thread tor then ring 11 bymeansof the handle 18 so as to bring the screw 21 to the end of the slot 20. The ring 19 will be stopped by the contact pin 25 on the screw 23. It will be understood that the lug 26 will also, when in proper adjustment, rest on the cam 27. The ring 19 is clampedwith the ring 11 by mean-s of the nut 22. The work moves forward and as the thread advances the dies are expanded throu h the action of the cam 27 to the taper esired. When the work has progressed to the desired position the cam nut 22 is loosened. This permits of the opening of the dies through the action of the lever 18 and rin 11 and the head may be then returned to 1ts initial position and re -set.

It is not practical, as a rule, to set the end of the pipe to an exact position. Consequently it is desirable to have the cam post 28 movedwith the head 8 up to a certain position, preferably a position in which the chasers have cut into the work just the width of a chaser and to have the post 28 retarded at this point so that with the continued advance of the head the taper of the narrow chaser will be continued. To effect this result I have provided the following mechanism: The post 28 is slidingly mounted on a guide 29 on the carriage 6 and has a bracket With a perforation 30 slidingly mounted on a rod 31. The bracket is split at 32 and provided with a screw 33 on which a clamping nut 3i is mounted. It will be readily seen that when the clamping nut 34 is operated the bracket is clamped on the rod 31 and when released the rod 31 can readily move through or slide, in the bracket. The rod 31 is stationary, and is mounted at one end on the bracket 35 secured to the frame 1. The opposite end of the rod extends through a bracket 36. mounted on the carriage 6. A stop lug 37 is mounted on the carriage 6 and is rovided with a stop screw 38 by means of which theinitial position of the post28 ,may be nicely adjusted. A spring 39 is arrangedon the rod 31 and between the post 28 and the bracket 36..

As the machine is; started. the clamping nut 34 is loosened. The spring 39 holds the post 28 aga inst the stop screw 38. vThe parts, therefore, all advance to ether until the chaser. The chasersare locked against movement axiall duringthe initial cutting.

by thelocking o the rings together and the action of the controlling canis The operap t s. t ecl mp na 't 41' clearto va ce. The-h re ket 6 a vancings, cqmp'resses" the, spriigg' .13 and? the screw. movest 'gtlie Ieftpt the post. At the completion o the out and prior to}the' starting of the next o oration. thecl'amping nut 34 is loosened an the spring .39 1noves e Width of mg thepo't 2815c the rod T u e carriage the post 28 to its initial position against the stop 38.

What I claim as new is 1. In a thread cutting machine, the combination of a head; chasers in the head; means for holding a pipe, said means and head having relative axial and rotative movement for advancing a thread and giving cutting movement; devices for movin the chasers radially in the head automatically as the cutting of the thread advances to follow the taper of the thread; mechanism locking the chasers against opening through cutting pressure prior to the action of said devices; and mechanism for varyin the. point in the relative travel of the headand means at which the devices begin to act.

2. In a thread cutting machine, the combination of a head; chasers in the head; means for holding a pipe, said means and head having relative axial and rotative movement for advancing a thread and for iving the rotary cutting movement; a cam ring on the head for actuating the chasers radially; de vices for actuating said ring auton'iatically to actuate the chasers as the cutting of the thread advances; mechanism locking the chasers against opening through. cutting pressure prior to the action of said devices; and mechanism for varying the point in the relative travel of the head and means at which the devices begin to act.

3. In a thread cutting machine, the combination of a head; chasers in the head; means for holding a pipe, said means and head having relative axial and rotative movement for advancing the cut and giving rotary cutting movement; a cam rin on the head for actuating the chasers ra 'ally; a ring actuating cam actuatin said ring to actuate the chasers automatica 1y as the cutting of the thread advances; mechanism locking the chasers. against 0 enin through cutting pressure prior to t e action of said devices; and mechanism for varying the point in the relative travel of the head and meansat which the ring actuatingcamhegins to act.

4. In a thread cutting machine, thecombzination of an axially movable head; chasers in the head; devices automatically moving the chasers in the head as the head advances; and mechanism for varying the ointir-i the travel of. the head at which sai devices begin to act. a I

5. Ina, thread cutting machine, the combination of an axially movable head; chascrs in the head; a ring on the head for actuat ng the chasers; and means for. automatically actuating the .ring as tie hea advancesion. expanding the. chasers to tel ow the taper of thethread'.

6. In a threadcntting machine,.the come binationnoii an axially movable head; ehas:

ers in the head; a ring on the; head for actuatlng the chasers a cam de i e um tially with the head and actuating when retarded the ring; and mechanism varying the point at which said device may be retarded.

7. In a thread cutting machine, the combination of an axially movable head; chasers in the head; devices automatically moving the chasers in the head as the head advances; means for locking the chasers against radial movement prior to the action of said devices; and mechanism for varying the point in the travel of the head at which the devices begin to act.

8. In a thread cutting machine, the combination of an axially movable head; chasers in the head; a ring on the head for actuating the chasers; and a cam device moving inwardly with the head and actuating the ring when retarded, said device locking the ring against movement actuating the chasers prior to the time the ring is retarded.

9. In a thread cutting machine, the combination of an axially movable head; chasers in the head; a ring on the head for actuating the chasers; a cam device yieldingly mounted to move with the head and actuating the ring when retarded; and mechanism for retarding the device.

10. In a thread cutting machine, the combination of an axially movable head; chas ers in the head; a ring on the head for actuating the chasers; a cam device yieldingly mounted to move with the head and actuating the ring when retarded; and mechanism for retarding the device, said mechanism being adjustable whereby the point in the travel of the head at which the device is retarded may be varied.

11. In a thread cutting machine, the combination of an axially movable head; chasers in the head; a ring on the head for actuating the chasers; a stationary rod; a cam device slidingly mounted on the rod and actuatin the rmg when retarded; a stop on the head initially positioning the cam device; a spring pressin the device against said stop; and means or locking the device with the rod to retard it.

12. In a thread cutting machine, the combination of an axially movable head; chasers in the head; a ring on the head for actuating the chasers; a stationary rod; a cam device slidingly mounted on the rod and actuatin the ring when retarded; a stop on the head initially positionin the cam device; a spring pressing the evice against said stop; and a split clamp for locking the device with the rod to retard it.

13. In a thread cutting machine, the combination of an axially movable head; chasers in the head; a ring on the head for actuating the chasers; a stationary rod; a cam copies of this patent may be obtained for device slidingly mounted on the rod and actuatin the ring when retarded; a stop on the hea initially positioning the cam device; a bracket on the head in which the rod is slidingly mounted; a spring between the bracket and the device; and means for locking the device with the rod to retard it.

14. In a thread cutting machine, the combination of a head; ehasers in the head; a cam ring on the head actuating the chasers; a releasing ring on the head having a rotative movement relatively to the head and cam ring; means for locking the releasing rin with the cam ring; and a cam device acting on the releasin ring to actuate the cam ring as the cutting of a thread advances.

15. In a thread cutting machine, the combination of a head; chasers in the head; a cam ring on the head actuating the chasers; a releasing ring on the head having a rotative movement relatively to the head and cam ring; means for locking the releasing ring with the cam ring; a cam device moving initially with the head and acting when retarded on the releasing rin to actuate the cam ring as the cutting o a thread advances; and mechanism for retarding the cam device.

16. In a thread cutting machine, the combination of a head; chasers in the head; a cam ring on the head actuating the chasers; a releasing ring on the head having a rotative movement relatively to the head and cam ring; means for locking the releasing ring with the cam ring; a lug on the releasing ring; a standard; a cam on the standard engaging the lug on the releasing ring giving to the releasing ring and with it the cam ring rotative movement as the head advances relatively to the standard to expand the chasers in accordance with the taper.

17. In a thread cutting machine, the combination of a head; chasers in the head; a cam ring on the head actuating the chasers; a releasing ring on the head having a rotative movement relatively to the head and cam ring; means for lockin the releasing ring with the cam ring; a ug on the releasing ring; a standard; a cam on the standard engaging the lug on the releasing ring giving to the releasing ring and with it the cam ring rotative movement as the head advances relatively to the standard to expand the chasers in accordance with the taper; and an adjustable stop fixing the initial position of the releasing ring.

In testimony whereof I have hereunto set my hand.

CHARLES F. WILLIAMS.

five cents each, by addressing the "Commissioner of Patents, Washington, D. 0." 

